Can I trust anyone, really?

This thing about couples when you tell one of them something and the other will def come to know about it. This I am not comfortable with at all really. I have my own privacy. Things I tell a guy might not be things I want a girl to know and vice versa. And it's not just gender issues. But of course I mean if I am among your topics of discussion then I am by all means, honored. Plus there is nothing I can do if I am your everyday topic.

But telling you things then thinking at the back of my head, 'Damn it he'll/she'll def know this' is never a good feeling for me. Sometimes I just feel like I can't tell anyone anything anymore and I really don't want this to come true.